chore: Add testcase for multiple grids in mesh2d (#607)

tests/dflowfm/test_net.py

@@ -180,10 +180,31 @@ def test_create_2d():
     mesh2d.create_rectilinear(extent=bbox, dx=0.5, dy=0.75)
 
     mesh2d_output = mesh2d.get_mesh2d()
+    assert np.isclose(min(mesh2d_output.node_x), 1)
+    assert np.isclose(max(mesh2d_output.node_x), 3)
+    assert np.isclose(min(mesh2d_output.node_y), -2)
+    assert np.isclose(max(mesh2d_output.node_y), 4)
     assert mesh2d_output.node_x.size == 45
     assert mesh2d_output.edge_nodes.size == 152
 
 
+def test_create_2d_multiple_grids():
+    bbox = (1.0, -2.0, 3.0, 4.0)
+    bbox2 = (-2.0, -2.0, 0.0, 4.0)
+
+    mesh2d = Mesh2d(meshkernel=MeshKernel())
+    mesh2d.create_rectilinear(extent=bbox, dx=0.5, dy=0.75)
+    mesh2d.create_rectilinear(extent=bbox2, dx=0.5, dy=0.75)
+
+    mesh2d_output = mesh2d.get_mesh2d()
+    assert np.isclose(min(mesh2d_output.node_x), -2)
+    assert np.isclose(max(mesh2d_output.node_x), 3)
+    assert np.isclose(min(mesh2d_output.node_y), -2)
+    assert np.isclose(max(mesh2d_output.node_y), 4)
+    assert mesh2d_output.node_x.size == 90
+    assert mesh2d_output.edge_nodes.size == 304
+
+
 @pytest.mark.parametrize(
     "deletemeshoption,inside,nnodes,nedgenodes,nfaces",
     [